You would want to click on the nearest snippet in the code, so “app.js:6015” (new gml_GmlVersion), or click on the function in Call Stack (if you have used GMS1/GMS2 debugger in past, this is about the same).
And yes to dialect; since they are extracted to AppData, it’s probably still there if you haven’t manually removed GMEdit directory after deleting the app’s folder.